Add a terrain def and use it

src/defs.rs

@@ -1,10 +1,10 @@
 use serde::{Serialize, Deserialize};
 
 #[derive(Serialize, Deserialize)]
-pub struct SurfaceDef {
-    label: String,
-    name: String,
-    description: String,
-    texture_index: u32,
-    support: f32,
+pub struct SurfaceDef<'a> {
+    pub label: &'a str,
+    pub name: &'a str,
+    pub description: &'a str,
+    pub texture_index: u32,
+    pub support: f32,
 }

src/main.rs

@@ -7,10 +7,45 @@ use bevy::{
     prelude::*,
 };
 use bevy_ecs_tilemap::prelude::*;
-use rand::{thread_rng, Rng};
+use defs::SurfaceDef;
 
 mod defs;
 
+const TERRAINS: [SurfaceDef; 3] = [
+    SurfaceDef {
+        label: "Mud",
+        name: "mud",
+        description: "Soil saturated with water.",
+        texture_index: 13,
+        support: 20.0,
+    },
+    SurfaceDef {
+        label: "Grass",
+        name: "grass",
+        description: "Green. Try to touch it.",
+        texture_index: 14,
+        support: 40.0,
+    },
+    SurfaceDef {
+        label: "Sand",
+        name: "sand",
+        description: "Gets everywhere, ruins vanilla sex fantasies.",
+        texture_index: 15,
+        support: 20.0,
+    },
+];
+
+#[derive(Component, Clone)]
+struct TileTerrain {
+    terrain_id: usize,
+}
+
+impl TileTerrain {
+    fn def(&self) -> &SurfaceDef {
+        &TERRAINS[self.terrain_id]
+    }
+}
+
 fn make_ground_layer(
     commands: &mut Commands,
     tilemap_size: TilemapSize,
@@ -19,18 +54,22 @@ fn make_ground_layer(
 ) {
     let mut tile_storage = TileStorage::empty(tilemap_size);
     let tilemap_entity = commands.spawn_empty().id();
-    let mut random = thread_rng();
 
     for x in 0..tilemap_size.x {
         for y in 0..tilemap_size.y {
             let tile_pos = TilePos { x, y };
+
+            let tile_terrain = TileTerrain { terrain_id: 1 };
             let tile_entity = commands
-                .spawn(TileBundle {
+                .spawn((
+                    tile_terrain.clone(),
+                    TileBundle {
                         position: tile_pos,
                         tilemap_id: TilemapId(tilemap_entity),
-                    texture_index: TileTextureIndex(random.gen_range(13..=19)),
+                        texture_index: TileTextureIndex(tile_terrain.def().texture_index),
                         ..Default::default()
-                })
+                    },
+                ))
                 .id();
             tile_storage.set(&tile_pos, tile_entity);
         }
@@ -39,9 +78,7 @@ fn make_ground_layer(
     let grid_size = tile_size.into();
     let map_type = TilemapType::default();
 
-    commands
-        .entity(tilemap_entity)
-        .insert(TilemapBundle {
+    commands.entity(tilemap_entity).insert(TilemapBundle {
         grid_size,
         map_type,
         size: tilemap_size,
@@ -61,12 +98,7 @@ fn startup(mut commands: Commands, asset_server: Res<AssetServer>) {
     let tilemap_size = TilemapSize { x: 320, y: 320 };
     let tile_size = TilemapTileSize { x: 32.0, y: 32.0 };
 
-    make_ground_layer(
-        &mut commands,
-        tilemap_size,
-        texture_handle,
-        tile_size,
-    );
+    make_ground_layer(&mut commands, tilemap_size, texture_handle, tile_size);
 }
 
 fn mouse_motion(
@@ -86,7 +118,8 @@ fn mouse_motion(
 
 fn main() {
     App::new()
-        .add_plugins(DefaultPlugins
+        .add_plugins(
+            DefaultPlugins
                 .set(WindowPlugin {
                     window: WindowDescriptor {
                         width: 1270.0,